u/Mediocre_Spot2051

Have shoulder pain. I work around 6 hours a day. The desk is a sit stand desk but it is already the lowest and unfortunately the chair is already at its highest.
Can someone tell me if this new posture and set up is good and how can I improve it🙏
Also, I have a headrest, but I don’t know should I install it because I sit up straight most the time

I have shoulder and upper back pain occasionally and I think it is due to my posture/set up. Any advice on how to deal with that and please point out any mistakes I made when I am sitting. Thank you